x1, y1, x2, y2 = map(float, input().split())

X = (x2 - x1)**2
Y = (y2 - y1)**2

distance = (X + Y)**(1/2)
print("%.8f" % (float(distance))) x1, y1, x2, y2 = map(float, input().split()) x1 map(float, input().split()) map float input().split() ().split () input split y1 x2 y2 X = (x2 - x1)**2 X (x2 - x1)**2 x2 - x1 x2 x1 2 Y = (y2 - y1)**2 Y (y2 - y1)**2 y2 - y1 y2 y1 2 distance = (X + Y)**(1/2) distance (X + Y)**(1/2) X + Y X Y 1/2 1 2 print("%.8f" % (float(distance))) print "%.8f" % (float(distance)) "%.8f" float(distance) float distance x1, y1, x2, y2 = map(float, input().split()) map(float, input().split()) x1 y1, x2, y2 = map(float, input().split()) map(float, input().split()) y1 y2 = map(float, input().split()) map(float, input().split()) y2 X = (x2 - x1)**2 (x2 - x1)**2 X distance = (X + Y)**(1/2) (X + Y)**(1/2) distance Y = (y2 - y1)**2 (y2 - y1)**2 Y x2, y2 = map(float, input().split()) map(float, input().split()) x2
x1, y1, x2, y2 = map(float, input().split())

X = (x2 - x1)**2
Y = (y2 - y1)**2

distance = (X + Y)**(1/2)
print("%.8f" % (float(distance)))